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Back to the Java!

Today you'll learn one more important aspect of Exceptions in Java. Also you'll learn what a Stack is and how a StackTrace is related to it.


Here's an example of a finally block:

FileInputStream stream = new FileInputStream(file);
  Reader reader = new BufferedReader(new InputStreamReader(stream, cs));
  StringBuilder builder = new StringBuilder();
  char[] buffer = new char[8192];
  int read;
  while ((read =, 0, buffer.length)) > 0)
    builder.append(buffer, 0, read);
catch (IOException e)

This code reads a file and outputs the contents into the console. The most important thing to note here is the finally block that closes the FileInputStream. If the stream.close() code was not in a finally block, and there was some sort of unexpected error (outside of an IOException) then the FileInputStream will not be closed, and it will potentially cause problems.


Here's an example of a typical StackTrace that you would encounter during your programming adventures:

Exception in thread “main” java.lang.Exception
    at net.javavideotutorials.example.TestProgram.openFile(
    at net.javavideotutorials.example.TestProgram.main(

As you can see, each line holds a reference to a Class name, a method name and a line number… perfect for tracing the error back to its roots!

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